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प्रश्न
Describe an experiment to prove that transpiration occurs more from the undersurface of dorsiventral leaves.
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उत्तर
Two equal pieces of cobalt chloride paper are dried and placed on the upper surface and the other on the lower surface of dorsiventral leaves. They are firmly held in place by pieces of cello tapes or glass slides. After a few minutes, the cobalt chloride paper shows change in colour from blue to pink. The time taken for the cobalt chloride paper on the upper surface of the leaf to turn pink is much longer than for the under surface. Thus, it proves that the rate of transpiration is greater from the undersurface of dorsiventral leaves.
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संबंधित प्रश्न
Transpiration is defined as:
Give suitable explanation for the following:
Perspiration and transpiration help to cool the body temperature of the organism.
Given alongside is the diagram of an experimental set-up to demonstrate a certain phenomenon in plants.
Name the phenomenon being demonstrated.
Comment on the following statement:
A well-watered potted plant shows wilting of leaves on a hot sunny day.
The figure below represents the set-up at the start of certain experiment to demonstrate an activity of plants:
(i) What is the aim of the experiment?
(ii) Why has oil been put in each test tube?
(iii) What will be the observations in the two test-tubes after about 2-3 days?
(iv) Give reasons to explain any change observed as answered in (iii) above.
(v) Why has the test-tube b without the plant, been taken in the experiment?
Choose the correct answer:
The percentage of cuticular transpiration in plants is _____________
Define the following term:
Transpiration
Boojho’s uncle was hospitalised and put on dialysis after a severe infection in both of his kidneys.
When does it become necessary to take such a treatment?
Excessive transpiration is due to ______.
Briefly describe the following:
Angina Pectoris
